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Full text of "Text Book Of Mechanical Engineering"

268

Erecting the Engine.

XXVIII.

XXIX.
XXX.

XXXI.

XXXII

XXXIII

XXXIV.

XXXV.
XXXVI.

LIST OF ENGINE DETA.IL$^—Continued.

Governor Details
Steam. Cylinder
Cylinder Covers

Main Slide Valve       ........

Expansion Slide Valve

Figs.
261-2
263-4
265
266
267

Fly Wheel       ............    268

Bed Plate       ............    269

Brass Work     ...        ...        ...        ...    270

Bolts and Studs (not drawn).

The Erector is how to b'e provided with a * General Arrange-
ment/ or complete drawing,of the engine, in plan and elevation,
having certain principal dimensions supplied. This drawing is
given in Figs. 271 and 272.

The Bed of the engine is slung, and lifted by travelling crane
into position on blocks of wood, as at #, Fig. 273, and then
levelled with wood wedges and the aid of the square shewn in
Fig. 196; the cylinder and bearings then adjusted on their
seatings approximately; the back and front end of cylinder
bore being bridged with iron bars, the first having a small hole
drilled centrally arid horizontally, and the second having a
central notch in its "upper edge (see A and B) : a strong, fine
string b is knotted and passed through the hole, .and carried to
the front of t'he bed, where it is pulled tight and wrapped round
the support c'• the latter being set with one edge agreeing with
centre line of cylinder, as measured from the bearing seatings,
and having "notches, as at i), to hold the string at the correct
height. This' string 'constitutes the main centre line, and the
front of the cylinder is adjusted to.suit by tapping the casting
with a hamnier, then clamping firmly to avoid accidental move-
ment'           "

The Bearings are next adjusted Pass a long straightedge, %
through the brasses, and support it on level blocks till its upper
surface nearly'touches the string. Clamp the large $4uare F uport
E, near the string, and support on block G; then prerjare a lath B,
to measure ' the length from cylinder face to edg& of bearing
brasses, and* mark distances on the straightedge B, on each side